1. Patient is currently enrolled in a Novartis-sponsored, Oncology Clinical Development & Medical Affairs study receiving imatinib and has fulfilled all their requirements in the parent study. 2.Patient is currently benefiting from the treatment with imatinib, as determined by the investigator. 3. Patient has demonstrated compliance, as assessed by the investigator, with the parent study protocol requirements.4. Willingness and ability to comply with scheduled visits, treatment plans and any other study procedures. 5. Written informed consent obtained prior to enrolling in roll-over study.